- 1.
当…的时候，在…时候 -
• I used to be very shy when I was a child. 我小时候很害羞。 - 2.
一…就…；每当 -
• When I read the book now I can't help thinking of my father. 现在每当我读这本书时我都会想到我的父亲。 - 3.
其时；然后 -
• The daughter had just come home when her father dropped in. 女儿刚刚到家，她父亲就来到了。 - 4.
既然，在…情况下 -
• How can she pass the exam when she won't study hard? 她不愿努力学习，怎么能通过考试呢？ - 5.
虽然，尽管 -
• He walked when he could ride. 虽然可以坐车但他却步行。